Driving traffic-clogged roads to Baltimore is no fun. Ditto taking a crowded shuttle from Washington D.C. to New York. Which is why for the commuting masses (like yours truly), something tantalizing’s in the air: a privately funded company’s vision to build a $10 billion, high-speed, magnetically propelled train that would cut travel between the nation’s capital and Baltimore to 15 minutes, about the time it takes to casually walk a dozen city blocks.